/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.example.factorial;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import java.math.BigInteger;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

/**
 * Handler for a client-side channel. This handler maintains stateful
 * information which is specific to a certain channel using member variables.
 * Therefore, an instance of this handler can cover only one channel. You have
 * to create a new handler instance whenever you create a new channel and insert
 * this handler to avoid a race condition.
 */
public class FactorialClientHandler
        extends SimpleChannelInboundHandler<BigInteger>
{

    private ChannelHandlerContext ctx;

    private int receivedMessages;

    private int next = 1;

    final BlockingQueue<BigInteger> answer = new LinkedBlockingQueue<BigInteger>();

    public BigInteger getFactorial()
    {
        boolean interrupted = false;
        try
        {
            for (;;)
            {
                try
                {
                    return answer.take();
                }
                catch (InterruptedException ignore)
                {
                    interrupted = true;
                }
            }
        }
        finally
        {
            if (interrupted)
            {
                Thread.currentThread().interrupt();
            }
        }
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx)
    {
        this.ctx = ctx;
        sendNumbers();
    }

    @Override
    public void channelRead0(ChannelHandlerContext ctx, final BigInteger msg)
    {
        receivedMessages++;
        if (receivedMessages == FactorialClient.COUNT)
        {
            // Offer the answer after closing the connection.
            ctx.channel().close().addListener(new ChannelFutureListener()
            {
                @Override
                public void operationComplete(ChannelFuture future)
                {
                    boolean offered = answer.offer(msg);
                    assert offered;
                }
            });
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
    {
        cause.printStackTrace();
        ctx.close();
    }

    private void sendNumbers()
    {
        // Do not send more than 4096 numbers.
        ChannelFuture future = null;
        for (int i = 0; i < 4096 && next <= FactorialClient.COUNT; i++)
        {
            future = ctx.write(Integer.valueOf(next));
            next++;
        }
        if (next <= FactorialClient.COUNT)
        {
            assert future != null;
            future.addListener(numberSender);
        }
        ctx.flush();
    }

    private final ChannelFutureListener numberSender = new ChannelFutureListener()
    {
        @Override
        public void operationComplete(ChannelFuture future) throws Exception
        {
            if (future.isSuccess())
            {
                sendNumbers();
            }
            else
            {
                future.cause().printStackTrace();
                future.channel().close();
            }
        }
    };
}
